wright



4 Sheets-Sheet 1.

(No Model.)

H. WRIGHT. LOOM LET-OFF MECHANISM.

Patented Feb. 2'7, 1894.

SNG COMPANY.

(No Model.) 4 Sheets-Shet 2.

' H. WRIGHT. LOOM LET-OFF MECHANISM.

No. 515,639. Patented Feb. 27, 1894.

UNITED STATES PATnNr much.

LOOM LET-OFF MECHANISM.

SPECIFICATION forming part of Letters Patent No. 515,639, dated February 27, 1894. Application file-d April 21, 1393. Serial No. 471.283. (No model.)

To all whom it may concern:

Be it known that I, HEBDEN WRIGHT, a subject of the Queen of Great Britain, residing at Ingrow, near Keighley, in the county of York, England, have invented a new and useful Improvement in Loom Let-01f Mechanism, of which the following is a specification.

My invention relates to improvements in that class of mechanism used in connection with looms, which is known as friction letoff mechanism, and consists in so constructing and arranging the parts forming said mechanism that certain advantages incident to the use of the old and common rope and lever devices are secured with the additional advantages accruing through my said improved means enabling the weaver or operative to disengage or to engage the warp beam as is from time to time found necessary for purposes well understood by those skilled in the art.

In the accompanying sheets of drawings which are illustrative of my inventi0n,-Fig ure 1 is a back elevation of a portion of the framework of a loom in which is mounted a warp beam to which my improved mechanism is shown as applied. Fig. 2 is a sectional end elevation on line A B of parts shown by Fig. 1 and as seen in the direction of the arrow a. Fig. 3 is a similar view to Fig. 1 but shows certain parts omitted and others in section so that parts hid in Fig. 1 are now illustrated. Fig. 4 is an end elevation of parts shown in Fig. 1 and as seen on the outside of the looms end frame. Fig. 5 is a view similar to Fig. 1, but shows the arrangement of the parts forming my improved mechanism as when used in connection with abroad loom. Fig. 6 is a similar view to Fig. 2 but is illustrative of parts shown by Fig. 5. Fig. 7 is a back elevation of one end of the warp beam and other parts applied thereto in their complete form, certain of such parts being omitted in Fig. 5.

Similar letters of reference indicate similar parts throughout the several views.

In carrying out my said invention I mount the warp beam 2) in its usual supports as in the notches or bearing spaces 0 c of the end frames (Z d and over the trunnions ee which are attached to or fixed on each of the extremities of the beam b I make to fit the friction-clamps f f the same being pivoted or hinged at their respective ends 9 to the end frames (1 d while at the other ends the pressure springs 71 h are applied. The tension on these pressure springs 72. h is increased or diminished by the tightening or loosening of the nuts on their respective screwed hooks it it which pass loosely through fixed bearings m m as shown.

Beneath the trunnions c e on the beam 5 are other friction clamps n n (these clamps n n as well as the others f f have their inner surfaces covered with roller-cloth, leather or other suitable frictioning material for purposes well known) that are carried by their shanks n n being secured upon the arms 0 and o of the lovers 0 0' respectively, both of the other arms 0 o of these levers 0 0, which are pivoted at p 19, being coupled by the link 0' to the lever s pivoted at s, a handle being formed on the outer end 5 of this lever s, so that by the weaver or operative manually lifting this handle 5 to place it over its retaining piece 6, its jointings or elasticity allowing it sufficient lateral motion so to do, while the gain in leverage reduces the power necessary to effect such a movement to such an extent that it may easily be accomplished even against the pressure of the springs 72. h. The clamps n n are pressed against the trunnions e c with sufficient force to raise the axial pins 1) b of the beam I) clear of the supports or bottom of the notches c c, in this manner constituting said clamps n n the sole support for said beam 1) the rotary motion of which they retard. By the beam b being thus entirely within the grip of its upper and lower clamps f f and n or respectively, the yielding of the springs h h which press the upper clamps into contact with it allowing its slight vertical movement caused by the pulling of the warp u on the beat-up of each shot of weft, while the natural elasticity and resilience of the levers o, o and s,

even when made in cast iron, cause the clamps 72/47. to follow said beam in its said upward movements so as to at all times secure this grip, the advantages desired are attained.

\Vhen the weaver or operative desires to ICC 

